Wear Micro-Mechanisms of Composite WC-Co/Cr - NiCrFeBSiC Coatings. Part II: Cavitation Erosion

Tribology in Industry

G. Vekinis¹  D. Kekes²  P. Psyllaki²  M. Vardavoulias³ 

[1] Department of Materials Science, Demokritos' National Center for Scientific Research, Aghia Paraskevi, 15310 Athens, Greece;Department of Mechanical Engineering, Technological Education Institute (TEI) of Piraeus, 250 Thivon Avenue and P. Ralli, 122 44, Egaleo, Greece;PyroGenesis SA, Technological Park of Lavrion, 195 00 Lavrion, Greece;

关键词: Composite coatings;    CerMet;    HVOF deposition;    Cavitation erosion;    Wear micro-mechanisms;   

DOI  :  

来源: DOAJ

【 摘 要 】

Composite coatings with five different proportions of WC-Co/Cr and NiCrFeBSiC components were deposited on stainless steel by HVOF spraying. Cavitation erosion tests were performed and the material removal micro-mechanisms were identified by SEM of both the eroded areas and the specimens’ cross-sections. Waves’ propagation and deflection at the weak interfaces within the coatings resulted in local tensile stresses perpendicular to the interface direction that eventually led to material removal. Such weak interfaces are the boundaries of the carbide particles with the metal binder within the same splat, those between splats along the same layer and those between successively deposited layers.

【 授权许可】

Unknown